A yarn tensile strength detection device and detection process

Abstract

The present invention relates to the technical field of yarn tension detection, and specifically to a yarn tensile strength detection device and detection process, comprising an equipment main body, a pay-off shaft is installed on the equipment main body, a top box is fixedly connected to the outer wall of the equipment main body, a bottom box is connected to the bottom of the top box, a middle hole is opened at the bottom of the top box, the middle hole is connected to the interior of the bottom box, an inner slide rail is opened inside the equipment main body, a driving motor is fixedly connected to the inner side wall of the inner slide rail, a threaded rod is arranged at the output end of the driving motor, a cross plate is threadedly sleeved on the outer wall of the threaded rod, and through the arrangement of the top box and the bottom box, when in use, the top box and the bottom box can repeatedly cut and install the same roll of yarn, so as to perform tension detection on the whole roll of yarn, which is more efficient and convenient than the traditional manual cutting and installing method, and improves the detection efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of yarn tension detection, and in particular to a yarn tensile strength detection device and a detection process. Background Art

[0002] Tensile strength testing is generally required during the yarn production process to ensure that the product meets standards and customer requirements, and to evaluate the performance of the yarn under various stress conditions to ensure that the fabric can meet the expected design service life. It can also optimize the production process, reduce yarn breakage and scrap rates, and improve production efficiency and yield rate.

[0003] In actual production, in order to accurately control the quality of a batch of products, it is usually necessary to conduct a comprehensive inspection of the same roll of yarn. When inspecting a roll of yarn, the existing yarn tension detection device usually requires staff to repeatedly intercept and clamp the yarn until the inspection of a roll of yarn is completed. The manual thread assembly and inspection method has a huge workload, which affects the inspection efficiency. In addition, the existing yarn tension detection device lacks a scraping device for the yarn surface. When the yarn is produced, its surface may contain fibers that are not completely embedded in the yarn and remain on the surface. If these floating fibers are not scraped off and directly inspected, the apparent diameter of the yarn may increase, causing deviations in parameters such as the yarn's elongation at break or breaking strength under the same tension, affecting the inspection accuracy. Summary of the invention

[0004] The purpose of the present invention is to provide a yarn tensile strength detection device and detection process to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a yarn tensile strength detection device, comprising an equipment main body, a pay-off shaft is installed on the equipment main body, a top box is fixedly connected to the outer wall of the equipment main body, the bottom of the top box is connected to a bottom box, a middle hole is provided at the bottom of the top box, the middle hole is connected to the interior of the bottom box, an inner slide rail is provided inside the equipment main body, a drive motor is fixedly connected to the inner wall of the inner slide rail, a threaded rod is provided at the output end of the drive motor, a cross plate is threadedly sleeved on the outer wall of the threaded rod, a wire pulling tube is provided on the cross plate, tensioners are provided on both sides of the wire pulling tube, an electric telescopic rod is provided on the tensioner, a wire clamping plate is provided at the end of the electric telescopic rod, and the wire clamping plate is located inside the wire pulling tube.

[0006] The yarn cleaning mechanism is arranged inside the top box to clean the broken yarn fibers on the surface of the yarn before the yarn is tested;

[0007] The stretching detection mechanism performs a stretching detection on the yarn after the yarn is cleaned.

[0008] Preferably, the yarn cleaning mechanism comprises a support frame arranged inside the top box, a mounting ring is arranged on the support frame, a scraper is arranged inside the mounting ring, and positioning pieces are slidably arranged on both sides of the mounting ring.

[0009] Preferably, push rods are fixedly connected to the outer walls of the positioning members on both sides, and one end of the push rod away from the positioning member slides through to the outside of the top box. A trigger magnet is provided at the end of the push rod, and tension springs are provided on both sides of the trigger magnet, and the other end of the tension spring is fixedly connected to the outer wall of the top box.

[0010] Preferably, both sides of the bottom box are vertically slidably connected with pressing protrusions, and the pressing protrusions on both sides are fixedly connected with driving magnetic blocks, the magnetic poles of the driving magnetic blocks are opposite to the magnetic poles of the triggering magnetic blocks, and a limiting groove is provided at the bottom of the top box, and a cutter is slidably connected to the inner side wall of the limiting groove.

[0011] Preferably, tension springs are fixedly connected on both sides of the cutter, one end of the tension spring away from the cutter is fixedly connected to the inner wall of the limiting groove, a cross bar is fixedly connected to the outer wall of the cutter, a pressing groove is provided on the pressing protrusion close to one side of the cross bar, and the end of the cross bar is in contact with the pressing groove.

[0012] Preferably, the stretching detection mechanism includes a wire clamping protrusion slidably connected to both sides of the bottom box, a side mounting plate is provided on the wire clamping protrusion, a return spring is fixedly connected to the outer wall of the side mounting plate, and the end of the return spring away from the side mounting plate is fixedly connected to the inner wall of the bottom box.

[0013] Preferably, side frames are provided on both sides of the bottom box, and side rods are slidably connected to the inside of the side frames on both sides, and the inner walls of the side rods are provided with sliding rails, and the inner walls of the sliding rails are slidably connected to pressure plates, and the pressure plates are provided with pressing springs, and one end of the pressing springs away from the pressing plate is fixedly connected to the inner wall of the sliding rail, and one end of the side rods away from the pressing plate is connected to the cross plate, and the pressure plate is located directly above the pressing protrusion.

[0014] Preferably, a bottom hole is opened at the bottom of the bottom box, and the bottom hole penetrates to the outside of the bottom box, and the bottom hole is located directly above the wire pulling tube.

[0015] Preferably, a plurality of limiting holes are provided on the device body, and the plurality of limiting holes are located directly below the pay-off shaft.

[0016] A detection process of a yarn tensile strength detection device, the process comprising the following steps;

[0017] S1: First, the yarn is rolled onto the pay-off shaft, then the yarn passes through the top box and the bottom box, and finally the yarn is tested by the tensile testing mechanism;

[0018] S2: Before the stretching test of the yarn, the yarn cleaning mechanism will first clean the floating fibers on the surface of the yarn;

[0019] S3: After the yarn cleaning mechanism has finished cleaning the yarn, it will limit and fix the yarn, and then cut it off for easy detection;

[0020] S4: After the tensile testing mechanism has finished testing a section of yarn, the wire drawing tube will continue to move into the top box to continue testing the next section of yarn.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. Through the setting of the top box and the bottom box, when in use, the top box and the bottom box can repeatedly cut and install the same roll of yarn, so as to perform tension testing on the entire roll of yarn. Compared with the traditional manual cutting and installing method, it is more efficient and convenient, and improves the detection efficiency.

[0023] 2. By installing the scraper and other mechanisms in the ring, the scraper will scrape and clean the surface of the yarn before the yarn is tested to prevent floating fibers from remaining on the yarn surface and ensure the tension test accuracy of the entire equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the local structure of the present invention Figure 1 ;

[0026] Figure 3 for Figure 2 A magnified view of middle;

[0027] Figure 4 It is a schematic diagram of the local structure of the present invention Figure 2 ;

[0028] Figure 5 It is a schematic diagram of the local structure of the present invention Figure 3 ;

[0029] Figure 6 for Figure 5 Enlarged view of middle B;

[0030] Figure 7 It is a schematic diagram of the local structure of the present invention Figure 4 ;

[0031] Figure 8 for Figure 7 Enlarged view of C in the middle.

[0032] In the attached drawings, the list of components represented by each number is as follows: 1. Equipment body; 2. Pay-off shaft; 3. Limit hole; 4. Inner slide rail; 5. Drive motor; 6. Threaded rod; 7. Side rod; 8. Cross plate; 9. Press spring; 10. Press plate; 11. Side frame; 12. Top box; 13. Bottom box; 14. Press protrusion; 15. Wire clamping protrusion; 16. Reset spring; 17. Side mounting plate; 18. Bottom hole; 19. Middle hole; 20. Push rod; 21. Support frame; 22. Mounting ring; 23. Pressing groove; 24. Positioning piece; 25. Scraper; 26. Drive magnet; 27. Trigger magnet; 28. Tension spring; 29. ​​Cross bar; 30. Cutter; 31. Limit groove; 32. Tension spring; 33. Wire pulling tube; 34. Wire clamping plate; 35. Electric telescopic rod; 36. Tensioner. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example 1: Please refer to Figure 1 - Figure 8 A yarn tensile strength detection device comprises an equipment body 1, a pay-off shaft 2 is installed on the equipment body 1, a plurality of limit holes 3 are arranged on the equipment body 1, and the plurality of limit holes 3 are located directly below the pay-off shaft 2, a top box 12 is fixedly connected to the outer wall of the equipment body 1, and a bottom box 13 is connected to the bottom of the top box 12, a bottom hole 18 is provided at the bottom of the bottom box 13, and the bottom hole 18 penetrates to the outside of the bottom box 13, and the bottom hole 18 is located directly above a wire drawing tube 33, a middle hole 19 is provided at the bottom of the top box 12, and the middle hole 19 is connected to the inside of the bottom box 13, an inner slide rail 4 is provided inside the equipment body 1, a driving motor 5 is fixedly connected to the inner side wall of the inner slide rail 4, a threaded rod 6 is arranged at the output end of the driving motor 5, a horizontal plate 8 is threadedly sleeved on the outer wall of the threaded rod 6, and a wire drawing tube 33 (such as Figure 8 As shown in the figure, tensioners 36 are arranged on both sides of the wire drawing tube 33, and electric telescopic rods 35 are arranged on the tensioners 36. The ends of the electric telescopic rods 35 are provided with clamping plates 34, and the clamping plates 34 are located inside the wire drawing tube 33. The yarn cleaning mechanism is arranged inside the top box 12. Before the yarn is detected, the broken yarn fibers on the surface of the yarn are cleaned. The yarn cleaning mechanism includes a support frame 21 arranged inside the top box 12, and a mounting ring 22 is arranged on the support frame 21. A scraper 25 is arranged inside the mounting ring 22 (as shown in the figure). Figure 6 As shown in FIG. 1 ), positioning members 24 are slidably provided on both sides of the interior of the mounting ring 22.

[0035] The outer walls of the positioning members 24 on both sides are fixedly connected with push rods 20, and one end of the push rod 20 away from the positioning member 24 slides through the outside of the top box 12. The end of the push rod 20 is provided with a trigger magnetic block 27, and both sides of the trigger magnetic block 27 are provided with tension springs 28. The other end of the tension spring 28 is fixedly connected to the outer wall of the top box 12. Both sides of the bottom box 13 are vertically slidably connected with pressing protrusions 14, and the pressing protrusions 14 on both sides are fixedly connected with driving magnetic blocks 26. The magnetic poles of the driving magnetic block 26 are opposite to the magnetic poles of the trigger magnetic block 27. A limiting groove 31 is provided at the bottom of the top box 12, and a cutter 30 (such as Figure 4 As shown in FIG. 1 , both sides of the cutter 30 are fixedly connected with tension springs 32, one end of the tension spring 32 away from the cutter 30 is fixedly connected to the inner wall of the limiting groove 31, and a cross bar 29 is fixedly connected to the outer wall of the cutter 30, and a pressing groove 23 is formed on the pressing protrusion 14 close to the side of the cross bar 29, and the end of the cross bar 29 contacts the pressing groove 23 (as shown in FIG. 1 ). Figure 6 as shown).

[0036] In this embodiment, when used for the first time, the operator can put the yarn roll that needs to be tested on the pay-off shaft 2, and then pass the yarn on the yarn roll through multiple limit holes 3 to the mounting ring 22, and finally pass through the middle hole 19 and the bottom hole 18 to enter the wire drawing tube 33. When the yarn enters the wire drawing tube 33, the electric telescopic rods 35 on both sides are started to extend them, and the two clamping plates 34 are closed to clamp and fix the yarn end. When the yarn end is clamped and fixed, the operator can turn on the drive motor 5 to drive the screw to rotate. The threaded rod 6 rotates. When the threaded rod 6 rotates, the cross plate 8 drives the wire drawing tube 33 to move downward. When the wire drawing tube 33 moves downward, the yarn fixed by it will be pulled to move together, so that the yarn roll on the pay-off shaft 2 can be unwound, so that the entire yarn can be stretched. When the wire drawing tube 33 pulls the yarn, the yarn will pass through the mounting ring 22 and be scraped by the scraper 25 in the mounting ring 22. When the scraper 25 scrapes the surface of the yarn, the floating hair fibers on the surface of the yarn will be scraped and cleaned, so as to ensure the accuracy of subsequent tension detection.

[0037] Example 2: Please refer to Figure 1 - Figure 8, this embodiment further explains the first embodiment, the stretching detection mechanism, after the yarn is cleaned, the yarn is stretched and detected, the stretching detection mechanism includes a clamping protrusion 15 slidably connected to the inside of the bottom box 13 on both sides, a side mounting plate 17 is arranged on the clamping protrusion 15, the outer wall of the side mounting plate 17 is fixedly connected with a return spring 16, the end of the return spring 16 away from the side mounting plate 17 is fixedly connected to the inner wall of the bottom box 13, side frames 11 are arranged on both sides of the bottom box 13, the inside of the side frames 11 on both sides are slidably connected with side rods 7, the inner wall of the side rods 7 is provided with a slide rail, the inner wall of the slide rail is slidably connected with a pressure plate 10, the pressure plate 10 is provided with a pressing spring 9, the end of the pressing spring 9 away from the pressing plate 10 is fixedly connected to the inner wall of the slide rail, the end of the side rod 7 away from the pressing plate 10 is connected to the cross plate 8, and the pressing plate 10 is located directly above the pressing protrusion 14.

[0038] In this embodiment, while the cross plate 8 drives the wire drawing tube 33 to pull the yarn downward, it also drives the side rod 7 to move synchronously. When the yarn is stretched to a certain extent by the wire drawing tube 33, the pressure plate 10 that moves downward with the cross plate 8 and the side rod 7 will contact the pressing protrusion 14. Under the continuous pulling of the cross plate 8, the pressure plates 10 on both sides will squeeze the two pressing protrusions 14 respectively, so that the two pressing protrusions 14 move into the bottom box 13 respectively. When the two pressing protrusions 14 move into the bottom box 13, they will respectively follow the inclined surfaces of the two wire clamping protrusions 15 to push the two wire clamping protrusions 15 to the middle of the bottom box 13, so that the two wire clamping protrusions 15 are closed. When the two wire clamping protrusions 15 are closed, they will pass through the bottom hole 18. The yarn is clamped and fixed, and when the pressing protrusion 14 is squeezed and moved into the bottom box 13, the driving magnetic block 26 is driven to move synchronously. When the driving magnetic block 26 is away from the triggering magnetic block 27, the distance between the two becomes farther, and the magnetic attraction disappears. At this time, under the pulling force of the tension spring 28, the push rod 20 drives the positioning member 24 to move toward the middle of the mounting ring 22. When the positioning members 24 on both sides of the mounting ring 22 are closed toward the middle, the yarn passing through the mounting ring 22 is fixed, and the pressing protrusions 14 on both sides are squeezed and moved into the bottom box 13. In addition to making the positioning members 24 fix the yarn, when the pressing protrusion 14 close to the side of the cross bar 29 is squeezed and moved into the bottom box 13, the pressing groove 23 will slowly push the cross bar 29 and the cutter 30 to move to the right along its inclined surface (refer to Figure 6 ), the yarn passing through the middle hole 19 is cut and cut off. After the cutter 30 cuts and cuts off the yarn, under the above principle, the yarn is combined and fixed by the positioning member 24, so the yarn on the yarn roll will not bounce out of the mounting ring 22 after a section is cut off.

[0039] When the cross plate 8 drives the pressure plate 10 to squeeze the pressing protrusion 14 and move it into the bottom box 13, after the yarn is cut off, the wire drawing tube 33 will continue to move downward under the drive of the cross plate 8. Since the pressure plate 10 slides in the side rod 7, the cross plate 8 can continue to move downward after the pressure plate 10 squeezes the pressing protrusion 14. Under the elastic force of the pressing spring 9, the pressure plate 10 will always press the pressing protrusion 14, so that the two clamping protrusions 15 are closed to fix the cut yarn. When one end of the cut yarn is clamped by the two clamps The wire protrusion 15 is closed and fixed, and the other end is clamped and fixed by the wire clamping plate 34. As the wire pulling tube 33 continues to move downward, the cut yarn will be slowly straightened, and then a tensile test will be performed until the yarn is broken. Since the electric telescopic rod 35 is installed on the tensioner 36, when the wire clamping plate 34 that fixes one end of the yarn stretches the yarn, the tensioner 36 will detect the data of the cut yarn, collect the data, and remotely transmit it to a computer to facilitate later data analysis (this is a prior art and will not be elaborated on).

[0040] When the cut yarn breaks, the electric telescopic rod 35 will shrink, so that the clamping plate 34 will no longer be closed, and the fixation of the cut yarn will be released. At this time, the yarn will fall down by its own gravity and escape from the wire drawing tube 33. Then the operator can reverse the threaded rod 6 by driving the motor 5. When the threaded rod 6 reverses, the cross plate 8 will drive the wire drawing tube 33 to move upward. When the wire drawing tube 33 moves upward, it will drive the side rod 7 to move upward synchronously. When the side rod 7 moves upward, it will drive the pressing plate 10 to escape from the squeezing of the pressing protrusion 14. The two clamping protrusions 15 will slowly move to the two sides of the bottom box 13 under the pulling force of the return spring 16, and will no longer be closed. In the process of the clamping protrusions 15 moving to the two sides of the bottom box 13, the clamping protrusions 15 will push up the pressing protrusions 14 along their inclined surfaces, so that the pressing protrusions 14 return to their original positions. When the pressing protrusions 14 return to their original positions, the driving magnetic block 26 will be located on the positive side of the triggering magnetic block 27 again. At this time, under the action of the magnetic force of attraction, the triggering magnetic block 27 will overcome the pulling force of the tension spring 28 and drive the push rod When the pressing protrusion 14 near the side of the cross bar 29 returns to its original position, the pressing groove 23 no longer pushes the cross bar 29. At this time, under the pull of the tension spring 32, the cutter 30 will also return to its original position. As the cross plate 8 drives the wire drawing tube 33 to continue to move upward, the end of the wire drawing tube 33 will pass through the bottom hole 18 and the middle hole 19 to the bottom of the mounting ring 22. Under the above principle, after the yarn is cut off, the main yarn end on the yarn roll is always fixed on the mounting ring 22, so when the wire drawing tube 33 comes to the bottom of the mounting ring 22, the yarn end in the mounting ring 22 will enter the wire drawing tube 33, and then the electric telescopic rod 35 will re-control the wire clamping plate 34 to close, and re-clamp and fix the yarn end. After the wire clamping plate 34 re-clamps and fixes the yarn, the wire drawing tube 33 can continue to move downward through the threaded rod 6. Under the above principle, the tension test of the yarn will continue, and this cycle can be repeated without manually cutting off the upper line to perform tension test on the entire roll of yarn.

[0041] A detection process of a yarn tensile strength detection device, the process comprising the following steps;

[0042] S1: First, the yarn is wound onto the pay-off shaft 2, then the yarn passes through the top box 12 and the bottom box 13, and finally the yarn is tested by the tensile testing mechanism;

[0043] S2: Before the stretching test of the yarn, the yarn cleaning mechanism will first clean the floating fibers on the surface of the yarn;

[0044] S3: After the yarn cleaning mechanism has finished cleaning the yarn, it will limit and fix the yarn, and then cut it off for easy detection;

[0045] S4: After the stretching detection mechanism has finished detecting a section of yarn, the wire drawing tube 33 will continue to move into the top box 12 to continue detecting the next section of yarn.

[0046] It should be noted that the closing and releasing of the clamping plate 34 is controlled by PLC programming (this is a prior art and will not be elaborated in detail).

[0047] It should also be noted that when the cutter 30 cuts the yarn, the positioning member 24 fixes the yarn at this time, because the yarn has a certain elasticity when it is stretched straight. If it is not fixed, the yarn may pop out of the mounting ring 22 after being cut. When the wire pulling tube 33 enters under the mounting ring 22, the positioning member 24 loosens the yarn and does not fix it. Because the yarn is not stretched straight at this time, the yarn will not move outside the mounting ring 22 even if the yarn is not fixed.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A yarn tensile strength testing device, comprising a device body (1), characterized in that: A wire-releasing shaft (2) is installed on the device body (1); a top box (12) is fixedly connected to the outer wall of the device body (1); a bottom box (13) is connected to the bottom of the top box (12); a middle hole (19) is provided at the bottom of the top box (12); the middle hole (19) is connected to the inside of the bottom box (13); an inner slide rail (4) is provided inside the device body (1); a driving motor (5) is fixedly connected to the inner wall of the inner slide rail (4); a threaded rod (6) is provided at the output end of the driving motor (5); a horizontal plate (8) is threadedly sleeved on the outer wall of the threaded rod (6); a wire drawing tube (33) is provided on the horizontal plate (8); tensioners (36) are provided on both sides of the wire drawing tube (33); an electric telescopic rod (35) is provided on the tensioner (36); a wire clamping plate (34) is provided at the end of the electric telescopic rod (35); the wire clamping plate (34) is located inside the wire drawing tube (33); A yarn cleaning mechanism is arranged inside the top box (12) and cleans broken yarn fibers on the surface of the yarn before yarn detection. The yarn cleaning mechanism comprises a support frame (21) arranged inside the top box (12), a mounting ring (22) is arranged on the support frame (21), a scraper (25) is arranged inside the mounting ring (22), and positioning members (24) are slidably arranged on both sides of the inside of the mounting ring (22); Both sides of the bottom box (13) are vertically slidably connected to pressing protrusions (14), and both sides of the pressing protrusions (14) are fixedly connected to driving magnetic blocks (26), and the magnetic poles of the driving magnetic blocks (26) are opposite to the magnetic poles of the triggering magnetic blocks (27). The bottom of the top box (12) is provided with a limiting groove (31), and the inner side wall of the limiting groove (31) is slidably connected to a cutter (30); A stretch detection mechanism, which performs stretch detection on the yarn after the yarn is cleaned, the stretch detection mechanism comprising a thread clamping protrusion (15) slidably connected to both sides of the inside of the bottom box (13), the thread clamping protrusion (15) is provided with a side mounting plate (17), a return spring (16) is fixedly connected to the outer side wall of the side mounting plate (17), and one end of the return spring (16) away from the side mounting plate (17) is fixedly connected to the inner side wall of the bottom box (13); Side frames (11) are provided on both sides of the bottom box (13), and side rods (7) are slidably connected inside the side frames (11) on both sides. The inner side walls of the side rods (7) are provided with slide rails, and the inner side walls of the slide rails are slidably connected with a pressure plate (10). A pressing spring (9) is provided on the pressure plate (10), and one end of the pressing spring (9) away from the pressure plate (10) is fixedly connected to the inner side wall of the slide rail. One end of the side rod (7) away from the pressure plate (10) is connected to the cross plate (8), and the pressure plate (10) is located directly above the pressing protrusion (14).

2. A yarn tensile strength detection device according to claim 1, characterized in that: A push rod (20) is fixedly connected to the outer side walls of the positioning members (24) on both sides. One end of the push rod (20) away from the positioning member (24) slides through the outside of the top box (12). A trigger magnetic block (27) is provided at the end of the push rod (20). Tension springs (28) are provided on both sides of the trigger magnetic block (27). The other end of the tension spring (28) is fixedly connected to the outer side wall of the top box (12).

3. A yarn tensile strength detection device according to claim 1, characterized in that: Tension springs (32) are fixedly connected to both sides of the cutter (30); one end of the tension spring (32) away from the cutter (30) is fixedly connected to the inner wall of the limiting groove (31); a cross bar (29) is fixedly connected to the outer wall of the cutter (30); a pressing groove (23) is formed on the pressing protrusion (14) close to one side of the cross bar (29); and an end of the cross bar (29) contacts the pressing groove (23).

4. A yarn tensile strength detection device according to claim 1, characterized in that: A bottom hole (18) is provided at the bottom of the bottom box (13), and the bottom hole (18) penetrates to the outside of the bottom box (13). The bottom hole (18) is located directly above the wire drawing tube (33).

5. A yarn tensile strength detection device according to claim 1, characterized in that: A plurality of limiting holes (3) are provided on the device body (1), and the plurality of limiting holes (3) are located directly below the pay-off shaft (2).

6. A detection process of a yarn tensile strength detection device, using the yarn tensile strength detection device according to any one of claims 1 to 5, characterized in that: The process comprises the following steps; S1: firstly, the yarn is wound onto the pay-off shaft (2), then the yarn passes through the top box (12) and the bottom box (13), and finally the yarn is tested by the tensile testing mechanism; S2: Before the stretching test of the yarn, the yarn cleaning mechanism will first clean the floating fibers on the surface of the yarn; S3: After the yarn cleaning mechanism has finished cleaning the yarn, it will limit and fix the yarn and then cut it off. When the horizontal plate (8) drives the pressure plate (10) to squeeze the pressing protrusion (14) and move it into the bottom box (13), after the yarn is cut off, the wire drawing tube (33) will continue to move downward under the drive of the horizontal plate (8). Since the pressure plate (10) slides in the side rod (7), after the pressure plate (10) squeezes the pressing protrusion (14), the horizontal plate (8) continues to move downward. Under the elastic force of the pressing spring (9), the pressure plate (10) will always press the pressing protrusion (14), so that the two clamping protrusions can be moved downward. (15) is closed to fix the cut yarn. When one end of the cut yarn is closed and fixed by the two clamping protrusions (15), and the other end is clamped and fixed by the clamping plate (34) and as the wire pulling tube (33) continues to move downward, the cut yarn will be slowly straightened, and then a tensile test will be performed until the yarn breaks. Since the electric telescopic rod (35) is installed on the tensioner (36), when the clamping plate (34) that fixes one end of the yarn stretches the yarn, the tensioner (36) will detect the data of the cut yarn, collect the data, and remotely transmit it to the computer, so as to facilitate the data analysis later; S4: After the tensile testing mechanism has finished testing a section of yarn, the wire drawing tube (33) will continue to move into the top box (12) to continue testing the next section of yarn.

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